Helmet that hardens on impact.

Sticking to our safety theme I bring you the revolutionary new design in helmets. I think I will let the product description speak for itselef:

"It’s made with “intelligent molecules” that harden on impact. Sounds a bit iffy—don’t you want the thing to harden just slightly before impact? But apparently it works, because they’ve used the product in many test-falls and everyone is amazed at how well it protects the noggin (that, or the concussion is making them all really st00pid). The company also makes shoes and sports gear, but it seems to be available only in Europe for around $70."

-I do believe I have seen similar materials used on military vehicles and the occasional off-road hummer as shocks. Essentially its a metal mix that hardens rapidly. You do have to figure that a plastic shell would at least be requireed to secure the chin area and visor. This would mean however the perhaps helmets could become reusable.